Jumper wire basics Most of your current thermostat's wires will be connected to your thermostat and go through the wall to connect to your HVAC system. However, some thermostats will …

Identify a thermostat wire You need to check your current thermostat’s wires to tell if your system is Nest thermostat compatible and which thermostat models it will work with. Remove your …

Instead, C wires help deliver power from the system to the thermostat in case the other wires can’t provide enough power. Not all systems have a C wire installed, but Nest thermostats were …

Tip: If your existing thermostat is labeled 120 V or 240 V, has stranded wires, or has thick wires with wire nuts, your system is high voltage and not compatible. Remove the jumper wires or …

Learn about the common or C wire Nest thermostats are designed to use very little power, and in many cases they can use your system’s heating and cooling wires to get enough consistent …

The Nest app guides you through thermostat installation, but here are some more detailed instructions to walk you through everything you need to do to install your Nest thermostat on …

The most common labels for these wires are G or G1. Use our Compatibility Checker and enter the wires in your current thermostat. The checker will let you know if you can install a Nest …

If there's an overcurrent or “E” code, the electrical current on one or more wires connected to your Nest thermostat has spiked multiple times. Nest thermostats have an internal breaker to help …

Warning: Some 3rd party C wire adapters can cause problems or damage your Nest thermostat, even if they claim to be Nest compatible. We recommend using a Nest Power Connector to …

Some of these proprietary systems may also have the option to use standard heating system wires. In this case, a professional may be able to connect your system to a Nest thermostat. If …